Comparison of two ovulation tests to predict timing of the late follicular phase for menstrual cycle research in premenopausal females.

Change in estradiol from the EF to LF phase was negatively correlated with LF visit:ovulation interval with a zero day interval excluded ( r = −0.454, p = 0.050; Figure 2c ) and trending towards significance with all data points included ( r = −0.380, p = 0.080). 4.

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